复杂输电线路故障测距方法研究

发布时间：2018-01-10 08:38

本文关键词：复杂输电线路故障测距方法研究　出处：《南京理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着我国经济快速发展,电力负荷逐年增长,提高电网输电容量的需求十分迫切。然而我国输电走廊建设和耕地资源保护的矛盾十分突出,并且已经成为制约电网可持续大规模发展的主要瓶颈之一。复杂电力输电线路可以减少供电半径,节省电力设备投资、提高线路的使用效益,尤其在多个变电站交叉供电中得到广泛应用。随着复杂输电线路的不断兴起,众多学者开始对线路的故障测距方案进行研究。本文对输电线路信号奇异点的提取运用了时频原子分解法,并将这种方法应用在T型以及同杆并架双回输电线路故障测距中。对于同杆并架双回输电线路同名相跨线故障无法测量的问题,进一步提出了基于双模量的故障判别方法。在带有T型分支的输电线路中,利用单端工频故障信息或者行波故障信息较难实现各种故障情况下的故障测距。本论文运用故障初始行波波头到达三个测量端时间差的方法来判别故障支路,对于行波浪涌奇异点的提取则采用时频原子分解法,在综合比较了不同时频原子库下算法的计算性能后提出了基于Gabor原子库的MP分解算法,并对分解后的各个原子库进行时频分析,结果表明该方法受信号中的噪声干扰较小,能够有效地提取信号中的高频信息分量。同杆并架双回输电线路因线路之间电气量耦合较为严重,故障种类复杂多样。以往针对双回线的故障测距算法并不能够反应同名相跨线故障,本文在定性地比较经典相模变换矩阵的基础上,总结分析经典相模变换矩阵的不足,提出基于双模量的故障类型识别方法,该方法可以反应双回输电线路的所有故障种类。对故障行波波头奇异点的提取则采用了与上述T型线路相同的时频原子分解法。运用PSCAD以及MATLAB/SIMULINK电力系统仿真软件对算法进行大量仿真实验,仿真结果表明上述测距方案稳定性好,计算精度高、并且不受故障类型、故障位置、过渡电阻和系统运行方式变化的影响。
[Abstract]:With the rapid development of our economy and the increase of power load year by year, it is urgent to improve the transmission capacity of power grid. However, the contradiction between the construction of transmission corridor and the protection of cultivated land resources in China is very prominent. Complex power transmission lines can reduce the radius of power supply, save the investment of power equipment, and improve the efficiency of line use. With the rising of complex transmission lines, many scholars began to study the fault location scheme of the lines. In this paper, the time-frequency atomic decomposition method is used to extract the singularity of transmission line signals. This method is applied to fault location of T type and double circuit transmission lines. Furthermore, a fault discrimination method based on two modules is proposed. In a transmission line with a T-branch. It is difficult to realize fault location by using single terminal power frequency fault information or traveling wave fault information. In this paper, the method of time difference between the initial traveling wave head and the three measuring ends is used to identify the fault branch. The time-frequency atomic decomposition method is used to extract the singularity of traveling wave surge, and the MP decomposition algorithm based on Gabor atomic library is proposed after comparing the computational performance of the algorithm under the different frequency atom pool. The time-frequency analysis of the decomposed atomic banks shows that the method is less disturbed by the noise in the signal, and can extract the high-frequency information components from the signal effectively. Because of the serious electrical coupling between the two transmission lines, the fault types are complex and diverse. The previous fault location algorithms for double-circuit lines can not reflect the fault of the same name cross-line. On the basis of qualitatively comparing the classical phase mode transformation matrix, this paper summarizes and analyzes the shortcomings of the classical phase mode transformation matrix, and puts forward a fault type identification method based on two modules. This method can reflect all kinds of faults in double-circuit transmission lines, and the method of time-frequency atomic decomposition, which is the same as the T-type lines mentioned above, is used to extract the singularity points of the fault wave heads. PSCAD and MATLA are used to extract the singularity points of the fault wave heads. B / Simulink power system simulation software carries out a large number of simulation experiments on the algorithm. The simulation results show that the scheme is stable and accurate, and it is not affected by fault type, fault location, transition resistance and system operation mode.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM855

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